US2706495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacing device for concentric tubular units
Assignee: Dresser Industries Inc
•
Filing: 1950-11-18
•
Granted: 1955-04-19
•
Expires: 1970-11-18
Abstract
No abstract record available.
Inventors
- 👤 Roger E Risley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:15
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/12; F16L7/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US452565A
Cited
US1773398A
Cited
GB332914A
Cited
US1903467A
Cited
US1991455A
Cited
GB538119A
Cited
US2258135A
Cited
US2551867A
Cited
US2543954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |